/*
 * CodePress - Real Time Syntax Highlighting Editor written in JavaScript - http://codepress.org/
 * 
 * Copyright (C) 2007 Fernando M.A.d.S. <fermads@gmail.com>
 *
 * Contributors :
 *
 *    Michael Hurni <michael.hurni@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the 
 * GNU Lesser General Public License as published by the Free Software Foundation.
 * 
 * Read the full licence: http://www.opensource.org/licenses/lgpl-license.php
 */


CodePress = {
   scrolling : false,
   autocomplete : true,

   // set initial vars and start sh
   initialize : function() {
      if(typeof(editor)=='undefined' && !arguments[0]) return;
      chars = '|32|46|62|8|'; // charcodes that trigger syntax highlighting
      cc = '\u2009'; // control char
      editor = document.getElementsByTagName('body')[0];
      document.designMode = 'on';
      document.addEventListener('keyup', this.keyHandler, true);
      window.addEventListener('scroll', function() { if(!CodePress.scrolling) CodePress.syntaxHighlight('scroll') }, false);
      completeChars = this.getCompleteChars();
//    CodePress.syntaxHighlight('init');
   },

   // treat key bindings
   keyHandler : function(evt) {
      keyCode = evt.keyCode;  
      charCode = evt.charCode;
      
      if((evt.ctrlKey || evt.metaKey) && evt.shiftKey && charCode!=90)  { // shortcuts = ctrl||appleKey+shift+key!=z(undo) 
         CodePress.shortcuts(charCode?charCode:keyCode);
      }
      else if(completeChars.indexOf('|'+String.fromCharCode(charCode)+'|')!=-1 && CodePress.autocomplete) { // auto complete
         CodePress.complete(String.fromCharCode(charCode));
      }
      else if(chars.indexOf('|'+keyCode+'|') != -1) { // syntax highlighting
         CodePress.syntaxHighlight('generic');
      } else if (keyCode == 13) {
         CodePress.syntaxHighlight('enter');
      }
      else if(keyCode==9 || evt.tabKey) {  // snippets activation (tab)
         CodePress.snippets(evt);
      }
      else if(keyCode==46||keyCode==8) { // save to history when delete or backspace pressed
         CodePress.actions.history[CodePress.actions.next()] = editor.innerHTML;
      }
      else if((charCode==122||charCode==121||charCode==90) && evt.ctrlKey) { // undo and redo
         (charCode==121||evt.shiftKey) ? CodePress.actions.redo() :  CodePress.actions.undo(); 
         evt.preventDefault();
      }
      else if(keyCode==86 && evt.ctrlKey)  { // paste
         // TODO: pasted text should be parsed and highlighted
      }
   },

   // put cursor back to its original position after every parsing
   findString : function() {
      var sel = window.getSelection();
      var range = window.document.createRange();
      var span = window.document.getElementsByTagName('span')[0];
         
      range.selectNode(span);
      sel.removeAllRanges();
      sel.addRange(range);
      span.parentNode.removeChild(span);
      //if(self.find(cc))
      //window.getSelection().getRangeAt(0).deleteContents();
   },
   
   // split big files, highlighting parts of it
   split : function(code,flag) {
      if(flag=='scroll') {
         this.scrolling = true;
         return code;
      }
      else {
         this.scrolling = false;
         mid = code.indexOf('<SPAN>');
         if(mid-2000<0) {ini=0;end=4000;}
         else if(mid+2000>code.length) {ini=code.length-4000;end=code.length;}
         else {ini=mid-2000;end=mid+2000;}
         code = code.substring(ini,end);
         return code;
      }
   },
   
   // syntax highlighting parser
   syntaxHighlight : function(flag) {
      //if(document.designMode=='off') document.designMode='on'
      if(flag != 'init') {
         var span = document.createElement('span');
         window.getSelection().getRangeAt(0).insertNode(span);
         if ('enter' == flag) {
            //window.getSelection().getRangeAt(0).insertNode(document.createElement('br'));
            window.getSelection().getRangeAt(0).insertNode(document.createTextNode('\n'));
         }
      }

      o = editor.innerHTML;
      o = o.replace(/<br>/g,'');
//    o = o.replace(/<(b|i|s|u|a|em|tt|ins|big|cite|strong)?>/g,'');
//      alert(o)
      o = o.replace(/<(?!span|\/span|br).*?>/gi,'');
//      o = o.replace(/<br>/g,'\n').replace(/<span>/g, '\n').replace(/<.*?>/g,'');
//    alert(o)
//    x = o;
      x = z = this.split(o,flag);
      //alert(z)
//    x = x.replace(/\r\n/g,'<br>');
      x = x.replace(/\t/g, '        ');


      if(arguments[1]&&arguments[2]) x = x.replace(arguments[1],arguments[2]);
   
      for(i=0;i<Language.syntax.length;i++) 
         x = x.replace(Language.syntax[i].input,Language.syntax[i].output);

      editor.innerHTML = this.actions.history[this.actions.next()] = (flag=='scroll') ? x : o.split(z).join(x); 

      if(flag!='init') this.findString();
   },
   
   getLastWord : function() {
      var rangeAndCaret = CodePress.getRangeAndCaret();
      words = rangeAndCaret[0].substring(rangeAndCaret[1]-40,rangeAndCaret[1]);
      words = words.replace(/[\s\n\r\);\W]/g,'\n').split('\n');
      return words[words.length-1].replace(/[\W]/gi,'').toLowerCase();
   }, 
   
   snippets : function(evt) {
      var snippets = Language.snippets;   
      var trigger = this.getLastWord();
      for (var i=0; i<snippets.length; i++) {
         if(snippets[i].input == trigger) {
            var content = snippets[i].output.replace(/</g,'&lt;');
            content = content.replace(/>/g,'&gt;');
            if(content.indexOf('$0')<0) content += cc;
            else content = content.replace(/\$0/,cc);
            content = content.replace(/\n/g,'<br>');
            var pattern = new RegExp(trigger+cc,'gi');
            evt.preventDefault(); // prevent the tab key from being added
            this.syntaxHighlight('snippets',pattern,content);
         }
      }
   },
   
   readOnly : function() {
      document.designMode = (arguments[0]) ? 'off' : 'on';
   },

   complete : function(trigger) {
      window.getSelection().getRangeAt(0).deleteContents();
      var complete = Language.complete;
      for (var i=0; i<complete.length; i++) {
         if(complete[i].input == trigger) {
            var pattern = new RegExp('\\'+trigger+cc);
            var content = complete[i].output.replace(/\$0/g,cc);
            parent.setTimeout(function () { CodePress.syntaxHighlight('complete',pattern,content)},0); // wait for char to appear on screen
         }
      }
   },

   getCompleteChars : function() {
      var cChars = '';
      for(var i=0;i<Language.complete.length;i++)
         cChars += '|'+Language.complete[i].input;
      return cChars+'|';
   },

   shortcuts : function() {
      var cCode = arguments[0];
      if(cCode==13) cCode = '[enter]';
      else if(cCode==32) cCode = '[space]';
      else cCode = '['+String.fromCharCode(charCode).toLowerCase()+']';
      for(var i=0;i<Language.shortcuts.length;i++)
         if(Language.shortcuts[i].input == cCode)
            this.insertCode(Language.shortcuts[i].output,false);
   },
   
   getRangeAndCaret : function() {  
      var range = window.getSelection().getRangeAt(0);
      var range2 = range.cloneRange();
      var node = range.endContainer;         
      var caret = range.endOffset;
      range2.selectNode(node);   
      return [range2.toString(),caret];
   },
   
   insertCode : function(code,replaceCursorBefore) {
      var range = window.getSelection().getRangeAt(0);
      var node = window.document.createTextNode(code);
      var selct = window.getSelection();
      var range2 = range.cloneRange();
      // Insert text at cursor position
      selct.removeAllRanges();
      range.deleteContents();
      range.insertNode(node);
      // Move the cursor to the end of text
      range2.selectNode(node);      
      range2.collapse(replaceCursorBefore);
      selct.removeAllRanges();
      selct.addRange(range2);
   },
   
   // get code from editor
   getCode : function() {
      var code = editor.innerHTML;
      code = code.replace(/<br>/g,'\n');
      code = code.replace(/\u2009/g,'');
      code = code.replace(/<.*?>/g,'');
      code = code.replace(/&lt;/g,'<');
      code = code.replace(/&gt;/g,'>');
      code = code.replace(/&amp;/gi,'&');
      return code;
   },

   // put code inside editor
   setCode : function() {
      var code = arguments[0];
      code = code.replace(/\u2009/gi,'');
      code = code.replace(/&/gi,'&amp;');
         code = code.replace(/</g,'&lt;');
        code = code.replace(/>/g,'&gt;');
      editor.innerHTML = code;
   },

   // undo and redo methods
   actions : {
      pos : -1, // actual history position
      history : [], // history vector
      
      undo : function() {
         if(editor.innerHTML.indexOf(cc)==-1){
            window.getSelection().getRangeAt(0).insertNode(document.createTextNode(cc));
            this.history[this.pos] = editor.innerHTML;
         }
         this.pos--;
         if(typeof(this.history[this.pos])=='undefined') this.pos++;
         editor.innerHTML = this.history[this.pos];
         CodePress.findString();
      },
      
      redo : function() {
         this.pos++;
         if(typeof(this.history[this.pos])=='undefined') this.pos--;
         editor.innerHTML = this.history[this.pos];
         CodePress.findString();
      },
      
      next : function() { // get next vector position and clean old ones
         if(this.pos>20) this.history[this.pos-21] = undefined;
         return ++this.pos;
      }
   }
}

Language={};
window.addEventListener('load', function() { CodePress.initialize('new'); }, true);
